Alkali metals are one of the important causes that leads to poor permeability of charge column, irregular furnace operation, frequent hanging and scaffolding in the stack.

According to the analysis of the existing problem for kiln ash conveying, some measures for converting kiln ash conveying system by using charge column conveying technique are proposed.

To clear the array for new frame integration, the row and column electrodes in each pixel are momentarily switched to ground releasing, or "injecting" the charge into the substrate.